how to fix P0171 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's negative battery terminal to prevent electrical issues.
• Ensure the engine is cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum lines for cracks or disconnections.
  • Use a smoke machine or carb cleaner to identify leaks.
  • Replace any damaged hoses or gaskets.

3. Clean or Replace the Mass Airflow Sensor (MAF)

• Sub-steps:
  • Locate the MAF sensor along the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the MAF sensor with MAF cleaner spray. Allow it to dry completely before reinstalling.
  • If damaged, replace with a new MAF sensor.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the ON position (do not start the engine) and check the fuel pressure reading.
  • If the pressure is low, inspect the fuel pump and filter for issues and replace if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Check for clogs or signs of leakage.
  • Clean or replace injectors as needed using a fuel injector cleaner.

6. Check Engine Coolant Temperature Sensor

• Sub-steps:
  • Locate the coolant temperature sensor on the engine.
  • Disconnect the sensor and test its resistance with a multimeter to ensure it operates within specifications.
  • Replace the sensor if it fails the test.

7. Verify Intake Manifold Gasket

• Sub-steps:
  • Remove any components obstructing access to the intake manifold.
  • Inspect the gasket for signs of wear or leaks.
  • Replace the gasket if needed, ensuring proper torque specifications upon reinstallation.